马尾松产脂力、生长量和针叶中糖、淀粉含量的节律性变化

本文通过对不同龄级马尾松林分定点、定位、按月进行常法采脂和生长量调查，并测定针叶中可溶性糖及淀粉的含量，揭示了马尾松人工林林分的生长、发育以及内含物的变化规律。３５年生马尾松的产脂力和可溶性糖含量的相关性达到极显著水平，可溶性糖与淀粉含份呈负相关。产脂力和产脂量在年龄间和月份间都存在显著性差异，高产脂类型马尾松的产脂力和产脂量较普通马尾松有明显优势。经产脂力、生长量分析，初步确定马尾松的稳定采脂起始年龄，高产脂类型为２５年，普通马尾松为３０年。

The Rhythmic Changes in the Resin-Producing Capacity,Growth Increment,Sugar Content(in Needles)and Starch Content(in Needles)of Pinus massoniana

By means of the placement and location of Pinus massoniana stands with different age grades,theconventional-method resin tapping each month,the growth increment survey and the determination of the sol-uble sugar and starch content in needles,this paper revealed the change law of the growth,development andinclusion of stands of P.massoniana plantations.Through the analyses of resin-producing capacity and growthincrement the beginning age of stable resin tapping of P.massoniana was preliminarily determined.It was 25years old for the high-yield resin type of P.massoniana and 30 years old for the common type.